Heavy Color Registration Error; Display Of The Message "Color Adjustment Is In Progress" Appears Only Short Time; Though Reg Adjust Test Of Engine Maintenance Function Is Ok, Color Blur Occurs; Though Reg Adjust Testof Engine Maintenance Function Is Ng - Oki MC760 Maintenance Manual

7.5.5.(6) Heavy color registration error

(6-1) Display of the message "Color adjustment is in progress" appears only short time.

Check item
(6-1-1) Result of color registration error correction
Color registration Use the self-diagnostic mode and execute the
error correction REG ADJUST TEST. Check the result. Error
time (If a printer is is issued but is not displayed on the ON LINE
normal, it is approx. display.
40 seconds.)
(6-1-2) Toner
Remaining amount Check if the message "Prepare toner
of toner replacement." or "Replace the toner." appears or
not.
(6-1-3) Color registration error detection sensor
Sensor is dirty Is toner or paper dust attached to the sensor?
(6-1-4) Color registration error detection sensor shutter
Shutter operation is Check the shutter operation by the self-
faulty diagnostic mode
(6-2) Though the color registration correction test(REG ADJUST TEST) in self-diagnostic
mode is ok, color blur occurs
Check item
(6-2-1) Paper feed system
Paper feed system Check if any obstacle exists in the paper feeding
of the paper running path, that hampers smooth paper run.
path
Action to be taken
Check work
at NG
Replace the
sensor that
causes the error.
Clean the sensor
to remove stain.
Replace the
shutter. Replace
the PU board.
Replace toner
cartridge with
new one.
Clean the sensor
to remove stain
Replace the
shutter or tune
the mechanism
Action to be taken
Check work
at NG
Remove the
obstacle
(6-3) Though the color registration correction test(REG ADJUST TEST) in self-diagnostic
mode is NG.
Check item
(6-3-1) Result of color registration error correction
Result of color Use the self-diagnostic mode and execute the
registration error REG ADJUST TEST. Check the result.
correction
(6-3-2) LED Head
Set position of the Adjust the position of the LED Heads.
LED Head
(6-3-3) ID unit
Set position of the Remove and set the ID units.
ID unit
(6-3-4) Transfer belt unit
Set position of the Remove and set the Transfer belt unit.
Transfer belt unit
Defectiveness of the Replace the Transfer belt unit.
Transfer belt unit
7. Troubleshooting and repair procedure
Action to be taken
Check work
at NG
Retry the REG
ADJUST TEST.
Retry the REG
ADJUST TEST.
Retry the REG
ADJUST TEST.
Retry the REG
ADJUST TEST.
Retry the REG
ADJUST TEST.
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